netdev - Re: [tcpdump-workers] vlan tagged packets and libpcap breakage

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Message-Id: <DE6D5B28-FA1E-4F04-9BDF-F6D35878776E@alum.mit.edu>
Date:	Mon, 17 Dec 2012 02:35:33 -0800
From:	Guy Harris <guy@...m.mit.edu>
To:	"David Laight" <David.Laight@...LAB.COM>
Cc:	"Daniel Borkmann" <danborkmann@...earbox.net>,
	"Ani Sinha" <ani@...stanetworks.com>, netdev@...r.kernel.org,
	Michael Richardson <mcr@...delman.ca>,
	tcpdump-workers@...ts.tcpdump.org,
	Francesco Ruggeri <fruggeri@...stanetworks.com>
Subject: Re: [tcpdump-workers] vlan tagged packets and libpcap breakage

On Dec 17, 2012, at 1:50 AM, "David Laight" <David.Laight@...LAB.COM> wrote:

> How are you going to tell whether a feature is present in a non-Linux
> kernel ?

The Linux memory-mapped capture mechanism is not present in a non-Linux kernel, so all the libpcap work involved here would, if necessary on other platforms, have to be done differently on those platforms.  Those platforms would have to have their own mechanisms to indicate whether any changes to filter code, processing of VLAN tags supplied out of band, etc. would need to be done.

The same would apply to other additional features of the Linux memory-mapped capture mechanism that require changes in libpcap.  (Ideally, those changes would only require changes in order to use them, and would not break existing userland code, including but not limited to libpcap - your reply was to Daniel Borkmann, who is, I believe, the originator of netsniff-ng:

	http://netsniff-ng.org

which has its own code using PF_PACKET sockets.)

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